<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 登录表单 -->
      <el-form ref="formRef" label-width="0px" class="login_form" :model="form" :rules="formRules">
        <!-- username -->
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user" v-model="form.username"></el-input>
        </el-form-item>
        <!-- password -->
        <el-form-item prop="password">
          <el-input prefix-icon="el-icon-lock" v-model="form.password" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 登录表单的数据绑定
      form: {
        username: 'admin',
        password: '123456'
      },
      // 验证输入框值
      formRules: {
        username: [ // 验证用户名
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 5, max: 16, message: '长度在 6 到 16 个字符之间', trigger: 'blur' }
        ],
        password: [ // 验证密码
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 16, message: '长度在 6 到 16 个字符之间', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮，重置登录表单
    resetForm () {
      this.$refs.formRef.resetFields()
    },
    // 点击登录按钮，验证登录
    login () {
      this.$refs.formRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.form)
        console.log(this.form)
        console.log(res)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 会话期间保存的 token 值
        window.sessionStorage.setItem('token', res.data.token)
        // 成功后跳转的地址
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      top: -65px;
      height: 130px;
      width: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }

  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  .btns {
    display: flex;
    justify-content: flex-end;
  }

</style>
